Sweet spot training targets 86-95% of your FTP. The name comes from the tradeoff: it's the intensity that delivers the most training stimulus per unit of fatigue. High enough to push adaptation. Low enough that you can actually recover and do it again in two days.
Why it's so efficient
At sweet spot intensity, you're working hard enough to improve lactate clearance, mitochondrial function, and muscular endurance. But unlike full threshold work (100% FTP), the recovery cost is significantly lower.
Compare two riders in a build week:
- Rider A does 2x20 min at 100% FTP. That's 40 minutes of productive work, but she's wrecked for the next two days.
- Rider B does 3x20 min at 90% FTP across two sessions. That's 60 minutes of productive work, and she recovers overnight.
Rider B accumulates 50% more time at a productive intensity with less fatigue. Over months, that difference compounds into watts.
Who benefits most
- Time-crunched riders who can't do 12+ hours of Zone 2 per week
- Riders in base phase building toward full threshold work
- Returning riders rebuilding fitness after a break
- Anyone below ~4 W/kg (above that, you likely need more VO2max focus)
For elite riders who've been training for years, sweet spot alone may not be intense enough. But for most amateur cyclists, it's the fastest path to higher FTP.
Workouts
Week 1-2: 2x15 min at 88% FTP, 5 min recovery. If you can't finish both intervals, your FTP is set too high.
Week 3-4: 3x15 min at 90% FTP, 4 min recovery.
Week 5-8: 2x30 min at 90-92% FTP, 5 min recovery. This is where real gains happen.
For the masochistic: 1x60 min at 88% FTP. An hour of sustained sweet spot is a legitimate fitness test.
Execution tips
- Warm up 15-20 minutes, building gradually to Zone 3
- Settle into target power within the first minute of each interval
- Cadence 85-95 RPM, steady
- You should be breathing hard but rhythmically, not gasping
- When your pedaling form degrades, the interval is effectively over
- Cool down 10-15 minutes in Zone 1
How much per week
2-3 sweet spot sessions during a build phase. Balance with Zone 2 endurance rides and at least one full rest day. More than 3 sessions per week and the fatigue accumulates to the point where you're not recovering, which defeats the entire purpose.
The tradeoff
Sweet spot is a compromise. It's not as potent for VO2max as Zone 5 intervals, and it's not as easy to recover from as Zone 2. What it is, is the most efficient single tool for building FTP when training time is limited. Use it, but don't make it your entire diet.